package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERBitString;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;

public class IssuerSerial extends ASN1Encodable {
    GeneralNames issuer;
    DERInteger serial;
    DERBitString issuerUID;

    public static IssuerSerial getInstance(Object obj) {
        if (obj == null || obj instanceof IssuerSerial) {
            return (IssuerSerial) obj;
        }

        if (obj instanceof ASN1Sequence) {
            return new IssuerSerial((ASN1Sequence) obj);
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    public static IssuerSerial getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public IssuerSerial(ASN1Sequence seq) {
        if (seq.size() != 2 && seq.size() != 3) {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }

        issuer = GeneralNames.getInstance(seq.getObjectAt(0));
        serial = DERInteger.getInstance(seq.getObjectAt(1));

        if (seq.size() == 3) {
            issuerUID = DERBitString.getInstance(seq.getObjectAt(2));
        }
    }

    public IssuerSerial(GeneralNames issuer, DERInteger serial) {
        this.issuer = issuer;
        this.serial = serial;
    }

    public GeneralNames getIssuer() {
        return issuer;
    }

    public DERInteger getSerial() {
        return serial;
    }

    public DERBitString getIssuerUID() {
        return issuerUID;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * <pre>
     *  IssuerSerial  ::=  SEQUENCE {
     *       issuer         GeneralNames,
     *       serial         CertificateSerialNumber,
     *       issuerUID      UniqueIdentifier OPTIONAL
     *  }
     * </pre>
     */
    public DERObject toASN1Object() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(issuer);
        v.add(serial);

        if (issuerUID != null) {
            v.add(issuerUID);
        }

        return new DERSequence(v);
    }
}
